Remove last traces of MDI

ApplicationLibCode/UserInterface/RiuPlotMainWindow.h

@@ -22,15 +22,11 @@
 
 #include "cafPdmPointer.h"
 
-#include <QMdiArea>
 #include <QPointer>
 #include <QString>
 
 #include <memory>
 
-struct RimMdiWindowGeometry;
-
-class QMdiSubWindow;
 class RiuViewer;
 class RimViewWindow;
 class RicSummaryPlotEditorDialog;
@@ -119,8 +115,6 @@ private slots:
 
     void slotBuildWindowActions();
 
-    // void slotSubWindowActivated( QMdiSubWindow* subWindow );
-
     void selectedObjectsChanged( caf::PdmUiTreeView* projectTree, caf::PdmUiPropertyView* propertyView );
     void customMenuRequested( const QPoint& pos );